SANTA CLARA -- Kyle Williams isn't surprised that he's listed with Anquan Boldin as the 49ers' starting wideouts for Sunday's season opener. But Williams insisted this won't be a two-man show.

"That's how always we do things: we do it by committee," Williams said Tuesday. "I'll take on the responsibilities as the No. 2, but it's not going to be limited to me.

Expected to rotate with Williams in the 49ers' variable sets are Marlon Moore, Quinton Patton and perhaps Jon Baldwin. Newcomer Chris Harper is being groomed into the hybrid role previously filled by tight end Delanie Walker.

Moore also anticipates a platoon-like situation, noting: "If you're good, you're going to see the field. That's what I've learned from this coaching staff."

San Francisco 49ers Anthony Kyle Williams (10) carries the ball as he is tackled by Minnesota Vikings Jamarca Sanford (33) in the first quarter at Candlestick Park in San Francisco, Calif., on Sunday, Aug. 25, 2013 (Josie Lepe/Bay Area News Group)

Moore started all four exhibitions, and he's listed as a second-team wideout with Patton. Williams said Boldin takes on the unquestioned No. 1 role previously held by Michael Crabtree, who's out with an Achilles injury through at least November.

"We have playmakers and you'll see all of us," said Williams, who is relieved he'll get to play -- and return punts -- for the first time since sustaining a Nov. 25 knee injury.

Although the depth chart lists him as the No. 2 returner behind LaMichael James, Williams said he'll "for sure" be Sunday's punt returner against the Green Bay Packers while James recovers from Thursday's left-knee sprain. Williams classified himself as a "maybe" for kickoff-return duties.

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Williams sat out the exhibition season under what he termed doctors' orders. Come Sunday, "I expect to get the ball and do great things with it."

James doesn't think he'll be out long and hopes to better gauge his health as this week progresses.

"Anytime with a knee (injury), you always worry, but you've got to be a competitor," James said.

Harper, signed Monday off the Seahawks' practice squad, is already making the transition from wideout to H-back. That included watching film Monday night of how the 49ers utilized Walker, who now is starting for the Tennessee Titans.

"I've never gotten in a three-point stance before," Harper said. "I thought I was a great blocker playing receiver, but now I've got to block Aldon (Smith) and Patrick (Willis), so we'll see." Harper got No. 13 as he requested, and he expects to see some time at wideout.

When it comes to a mobile quarterback such as Colin Kaepernick, Packers linebacker Clay Matthews told ESPN radio their defensive strategy will be to hit the quarterback on read-option handoffs, to which 49ers guard Alex Boone said: "Nothing changes. Nobody ever touches Kap. That's the No. 1 rule."

Further evidence came Tuesday that the 49ers' quarterback corps may be unsettled: They worked out former Arizona Cardinals quarterback John Skelton, a league source confirmed. Skelton played the past three seasons with the Cardinals, and he threw for 282 yards and three touchdown passes in a Dec. 11, 2011, win over the 49ers. On Saturday, the Cincinnati Bengals cut Skelton, who was 8-9 all-time as a Cardinals starter, including a 1-5 mark last season in place of an injured Kevin Kolb.

Willis' right hand and wrist appear to be healing well. He wasn't wearing a cast or brace Tuesday, and he returned from a light workout carrying a water bottle in that hand.

The 49ers filled out their practice squad with former Philadelphia Eagles tight end Derek Carrier, a 6-foot-4, 241-pound prospect from Beloit College.

Aldon Smith and former 49er Delanie Walker were named in a lawsuit filed in Santa Clara County on Tuesday by a man who sustained gunshot injuries in his leg during a 2012 melee that occured outside Smith's San Jose home.

Ronndale Esporlas claims Smith and Walker repeatedly and illegally fired weapons on numerous occasions and also were aware the weapons were illegal. Smith sustained multiple stab wounds at the party, and his assailants were never identified.